Tamping machine



Jan. 20. 1925.- 1,523,937'

P.. S. EASTERDAY v TAMPING MACHINE Filed July 18, 1922 Arorn e y.

Patented Jan. 2G, 19255.

.'UgNgITiEfD ES O l" F ICE PHILIP S. EASTERDAY, OF PORTLND, OREGON, yASSIGNOR TO TUERCKAMACKENZIE COMPANY, A.CORPORA'lION OF OREGON.

TAMPING MACHINE.

`Application filed iJuly 18,11922.

Z'o uit iii/7mmz'f .way-concern.'

Be it vknown that-l, Piiiiiii SEiis'inRDA-r,

a citizen of the United IStates, residingiat Portlanchin the county of Multnomah and 5 fiitate oif Oregon, have invented a new and useful li'i'ij'irovenieiit in Tamping .Machines9 of' which the `following is aispeciiication, rei:- erence being had to the accompanying drawings.

My invention relates to ltamping `apparatus for concrete pipe forming machines.

The object ot'vmy invention is to provide tamping devices especially adapted to compact concrete `material upon-each -side i of metal reinforcement positioned in the forniiii-g apparatus.

lt is alsoan object of my invention tol provide taniping bars spaced apart-iipon leach side of `said lreinforcement and diiected 20 downwardly in divergingirelationto more thoroughly compact the plast-ic imaterialwaidjacent the outer and inner walls otfthe pipe.

I"lhese objects, aswell as lother advantages, lA attain bythe construction, combination 1and.arrangement of parts illustrated in the accompanying vdrawings which *form :a ypart hereof.

l3`i-gi'ii'e l is aside eleva-tion of the tampers, mechanism for their operation, and* forming lwipparatus, partly' in section.

Fig. vlliis a liront elevation ojitainpers, `with parts ot said niechaiiisn'i'and:apparatus Fig. lll is a :trontelevation olitampers and 'friction casing with parts broken away.

Like characters reterY torli-kefparts in'all views.

in upright 'iraiiie .4 is provided. At a convenientiheight, a siifinging bracket 5 is nuiuiited onl the iraiiie, thesame haring hori- Yzoiital arms 6 6. A horizontalslia'lt 7 is lrotatably lnioiinted in the flirame and bracket. A.Power transmitting mechanism 8 al 'il and intermediaten'ieclianism 9 arer arranged.

vshoes 21 on their lower ends.

Serial No. 575,857.

the pallet 12 and extends above the jacket.

'lvleans 1G are arranged in the upper part nected with the slialt- 7 by a crank and rod 1.9. 1Wooden tamping bars 2O extend through tlieguides 17h17 and casing 18. These bars are preferably provided with inet-.il lVithin 1 the casing a wedge-shaped spreader block is placed between lthe bars 20. 'lhe casing -wall `23isiadjacent to.r one outer iside orn the bars and a movable plate 23 to the opposing oliter-side. Between the wall 23 and plate 23 and the respective opposing bars, friction strips 2l are placed. Between the Yall olf the casing and the plate 23 a. spring is placed. A setting-screw 26, having a handle, is mounted in a threaded opening 2T `in the wall oit the traine to adapt the screw lto engage the spring 25 and press the blocks into engagement with the bars 20 to retain them in position at a desired height in `relation to their Iextension into the space within :the jacket 13, also to release them to allow their 4withdrawal from the jacket. ledgesha-ped blocks 2828 are Vplaced'between the tainpers ni tho guides 17u17. The

vblocks in therictioncasing and Y.chicles may be changed to spread the campers at their lower ends a desired distance apart.

core. and linished i product to t be removed. "lheiormer 12 issecured upon the table 10, the jacket placed over the toi-nier pallet and the core 14 and. reinforcingmaterial 15 are placed 11i the jacket as sliownnin Fig. l.

yThe screw 26 -is adjusted to allow the bars 20 to be slid to a position where their lower i ends are on each side of the `reinforcing niaterial 15 and approximately near the pallet 12, when the bars are secured in the casing. Plastic material is then placed by any convenient means into the space between the jacket and core while the table 10 is being rotated. During this time, power being transmitted to the shaft- 7, it causes the bars to tamp the material in a circular path core walls.

on both sides of the reinforcement. The friction blocks are adjusted for a clutch upon the tampers pre-determined to allow the tampers to slip upwardly, when the material below has been tampered to a desired density. lVhen it has attained such density, the mass is solid enough to force the tampersgradually upward and the tamping continues in this manner until the upper end of the jacket is reached. The tampers are then withdrawn and a circular former is inserted to produce the female joint end of the pipe. Then this is done the bracket allows the tampers to beswung to one side, the core is withdrawn and the jacket with the material rest-ing upon the pallet is removed to a A convenient place to cure. Heretofore great difficulty has been encountered in successfully imbedding reinforcing material, such as the wire netting here illustrated, in concrete pipes. Also in tamping about such reinforcing material in a manner to retain it in a proper and effect-ive position. I have overcome these difficulties by the device which tamps on each side of the reinforcement simultaneously. This distributes the material on both sides and through the wire, making aV homogeneous mass of the whole and of a desired density. In practice I have found the crushing resistance of pipe tamped with my device is a large percentage greater than that of an allV concrete pipe or with reinforcement tamped on one side only. The tamping bars being spread apart to close proximity with the jacket and core, the result is that the material is pressed against jacket and core and thence outwardly through the wire where it is want-ed, as well as being tamped downwardly. This prevents material crawling upward along the jacket and The tamping in this way proceeds evenly as the former is rotated below at a moderate speed.V It is obvious that the tampers maybe positioned apart for varying sizes of foi-mers and pipes. My device produces a most durable and satisfactory pipe, as practical demonstration has proven.

I claim:

1. In a concrete pipe machine, the combinationwith a rotatable mold and arcore therefor adapted to include a cylindrical body of reinforcement material therebetween, of a pair of tamping bars operative upon opposite sides of said reinforcement material, spaced guides for said tamping bars, a spreading block positioned in each said guide to separate said bars, a cas- Y ing mounted for reciprocative movements intermediate said guides through which said tamping bars extend, a spreader block positioned between said bars within said casing, a movable plate engaging one of said bars, a spring interposed between an end wall of said casing and impinging upon said movable plate, and means for tensioning or releasing said spring whereby said bars are frictionally engaged or realeased.

9.. In a concrete pipe machine, a pair of tamping bars, guides for said bars, a reciprocatively actuated casing intermediate said guides, means for frictionally engaging said bars within said casing, and spreaders wilhin said guides and casing adapted to maintain said bars in spaced relation.

3. In a concrete pipe machine, the combination with a rotatable mold and a core therefor adapted to include a cylindrical body of reinforcement material therebetween, of a pair of tamping bars operative upon opposite sides of said reinforcement material, spaced guides for said tamping bars, a wedge-shaped spreading block positioned in each said guide to separate said bars in downwardly diverging relation, a casing mounted for reciprocativc movements intermediate said guides through which said bars extend, a wedge-shaped spreader-block positioned between said bars within the casing, a movable plate engaging one of said bars, a spring interposed between an end wall of said casing and impinging upon said movable plate, and means for tensioning or releasing said spring whereby said bars are frictionally engaged or released.

4. In a concrete pipe machine, a pair of tamping bars, guides for said bars, a reciprocatively actuated casing intermediate said guides, means for frictionally engaging said bars within said casing, and wedge-shaped spreaders within said guides and said casing adapted to maintain said bars in downwardly diverging relation.

5. Iira concrete pipe machine, tamping mechanism consisting in a pair of tamping bars spaced apart in downwardly diverging relation, and means to aetuate said bars.

6. In a concrete pipe machine, a pair of tamping bars operatively secured in frictional engagement and spaced apa-rt in downwardly diverging relation.

PHILIP S. EASTERDAY. lVitnesses FRED G. lVILLs, C. E. FRASER. 

